Reversing mechanism



Sept. 4, 1928. I 1,682,901

C. M. F. FRIDEN REVERSING 'MECHAKISH Filed April 13. 1926 2 Slieets-Sh'et 1 IIYEITOP L'nRL M f. FRIDEN -46, dinner:

Sept. 4,1928. 1,682,901

. C. M. F. FRIDEN REVERSING MECHANISM Filed April 13, 1925. I 2 Sheets-Sheet 2 FIE E F 115-4- A Trans 1;

' ism... 4, f192a Application fled April a, eam; 101,653. i

The inventiol toa reversing mechanism for versing the direction ofrotation of a rotatable element.

An object-of the invention is to provide 5 a reversing mechanism that cannot be ope-r ated to disturb the timing of the reversible .element.

Another object of the invention is to prowide a reversing mechanism of simple con- 19 struction and compact arrangement.

The invention possesses other advantageous features, some of which with the fore going will be set forth at length in the following descriptiom'where I shall outline in full that form of the invention which'I have selected for illustration in the drawings accompanying and forming part of the present cation. In said drawings I have own one form of the ,reversing mecha- 20 nism of my invention incorporated in a calculating machine of the flitary type, but it is to be understood that the reversing. mechanism may be used in other environments and that the inventiomas set forth in the claims,

, embodied in a plurality of forms.

erring to said drawings:

Figure 1 is an elevation of a portion of a machine employing the reversing 4 mechanism of my invention, the reversing #0 mechanism being shown in section.

Figure with which the reversing mechanism is associated, taken on the line 22, Figure 1.

Figure machine taken on the line 3-3, Figure 1.

Figure 4 is an elevation of a portion of the calculating machine showing the opposite side ofthe standard shown in Figure 3.

gure 5 is an elevation of the driving shaft on which the reversing gears arejour- Figure 6 is an end elevation of the pair of reversing gears, the rings surrounding. the 46- shoulders on the gears being shown in section.

Figure 7 The reversing mechanism of my invention I0 is particularly adapted for use in' calculating machines of the rotary type, hav ng a reversible rotary actuator which has a single full cycle or stop position. In calculating machines of this type, it is essential that the ll actuator always be brought to a stop in full,

cycleposition therefore it is essential 2 is a vertical section of the clutch.

3 is a section of the calculating is a side elevation of one of the that ,a' reversing mechanism be. employed which will prevent the reversal of the actuator at any time other than that which will result in the actuator being brought to stop at full cycle position. Ordinarily the reversing mechanism is actuated to reverse the direction of rotation of the actuator, only when the actuator is stopped in full cycle position, but through improper operation of the calculating machine, an attempt \may be made to shift thereversing mechanism during the time that the actuator is in rotation and the present invention provides a reversing mechanism of such construction that if an attempt is made to shift the reversing mechanism during the time that. the actuatoris in rotation, and such attempt results in the shifting of the reversing mechanism, the timing of the actuator with respect to the drivingshaft, will not be disturbed, so that when the mechanism is brought to tion.

- Calculating machines of this type comprise a driving motor, which is connected through suitable gearing with an operating shaft 3, which is rotated continuously with the motor. interposed between the operating shaft "3 and the driving shaft 4 is a clutch and stop mechanism, having a single full cycle position. interposed between the driving shaft 4 and the rotatable actuator 5, rotation of which serves tointroduce values entered into the actuator, into the counting mechanism, is a reversing gear whereby the direction of rotation of the actuator may be reversed. The actuator has a single full cycle position, corresponding to the single full cycle position of the clutch and the rerest, the actuator will stop infull cycle posiversing mechanism is so constructed that the .housing 7 which is secured to the flange 8 on driving shaft 4.

the endof the hollow I Pivoted in the end of the housing 7 1s a clutch dog 12 having atooth 13 on one end adapted to engage the ratchet 6. The dog 12 is urged in a direction to cause engagement of the tooth with the ratchetrby. the spring 14. The clutch dog 12 is provided on its other end with a projection 15 which when the tooth is in engagement with the ratchet,

extends outward throughgan aperturein the I clutch housing 7. Means, such as.the lever 16, is provided for engaging the projection y 15 and depressing it into the\ housing,

thereby disconnecting the lever 12 from the 1 ratchet 6. The end of thelever 16 extends into the aperture in the wall of the housing,

thereby bringing the housing to rest in full cycle position. In the operation of the calculating machine, the lever 16 is normally in engagement with the housing and operation of the lever 16 to remove it from engagement with the housing, causes engagement of the machine until the lever 16 15 clutch and the operation of the calculatingv subsequently disen ages the clutch.

ournaled on the hollow shaft 4 are two' contiguous gears 21 and 22, each gear being rovided on one side with an annular shouler 23, the'shoulders of the two gears being arranged cont-iguously. v Each shoulder 23 is provided with two diametrically opposed slots orseats 24 and 25, the two seats being I of difl'erent lengths radially, for reasons which will hereinafter appear. For pur-- poses of production, it is advantageous to cut the two seats at one operation and to make them both of the same length radially, and one of the seats 24 is subsequently shortened to make it ofdifierent -ngth radially than the seat 25. The shortening of the seat 24 is preferably accomplished by the use of a ring 26, engaging the annular shoulder 23. and being provided with a projection 27 which extends into the. seat 24. The extension 27 may comprise a stud or screw seated in the ring 26. It is understood that there aretwo rings 26, one for each of the gears 21 .and 22, so that each gear is provided' with two seats of different lengths radially.

Arranged in the hollow shaft 4 and extending therefrom is a stub-shaft 28 which is adapted to be moved lon 'tudinally within the hollow shaft 4. The. ollow shaft 4 is provided at that part on which the. gears 21 and 22 bear, with a transverse slot 29, and seated in the inner-end of the stub-shaft 28 .is a transverse pin 31 which is disposed in the slot 29. The ends of the pin 31 extend beyond the periphery of the hollow shaft 4 and into one o the pairs of seats 24- 25 formed in the annular shoulders 23 of the gears 21 and 2 2. The two ends'of the 'pin 31 areof different length, one end seating 'in. the short seats 24 and the other and longer end inlthe long seats 25. The pin is ofs'uch' diameter that it will seat in the seatsin one gear and-be out of engagefwill always be brough enoe in the'length of the seats 24 and 2! and the length of the two ends of the'pii 31, the pin may be. shifted only after-thi gears 21 and 22 have made a half or a whol| revolution, or a multiple-of a half or whole revolution. In other words, it is im possible to shift the pin 31 .at any poilv other than the half cycle or full cycle tion of the gears 21-22. When the gear. 21-22 are infull cycle position, as mdi cated in Figure 1, the clutch housing is i1 full cycle position and the actuator is m ful cycle positlon. Normally the in is Shiftilbli only when the actuator is in 11 cleposi ti on, but, in the event that it is shi whei the actuator is in half cycle position, thl clutch housing will simultaneously be in halt cycle position, so that the relationship ofth' actuator to the clutch housing is not dis turbed. The clutch housing can be stoppei only in full cycle position, and consequentl; with this reversing gear, regardless of th' time of rev rsal, the actuator will always sto in full cyc e position.

In Figures 3 and 4, only a few of the teetl on each of the gears are shown, but it is t be understood that the gears are complet gears, being provided on'their peripherie with regularly spaced-teeth. Meshing wit] the reversing gear 22 in gear 45 ofequa pitch diameter, which is secured to the shai 46, suitably journaled in the machine. Mesh ing with the gear .45 and with the other're versing gear 21 is an idler-gearv 47. Secure to the shaft 46 is a gear 48 of the samepitc] diameter which meshes with a similar gen 49,'which in turn meshes with a similar gea 51, secured to the shaft 52 of the actuator t By longitudinally the. pin-31, th direction of rotation of the gears 21 and -2 is reversed and consequently the directioi of rotation of the gear 45 and consequentl; the direction of rotation of the gear 51, 1 reversed, thereby causing reversal of -th direction of rotation of the actuator 5. Th

gears 21 and 22 are rotated at a, fairly speed, so that the accidental of actuator with respect to the stop mechanisn will not be disturbed, so that theraetuato t to rest in full cycl position. The devices .for th clutch lever 16 to caus entoftheclutchare application SerialNumber 546 filed February 18, 1924 which ha -matured into Patent No. 1,643,710, Septem her-27, 1927 to which reference is here made for a more complete disclosure of th calculating machine in which the device 0 the present-invention is embodied.

1. A reversing comprising driving shaft having a diametric slot therein,

a pair of-conti ous ars rotatably mounted on said sha sai gears being provided on their contiguous sides with diametrically disposed seats of diflerent len'gths on the opposlte sides of the axis of the gears, a transverse pin disposed in said slot and extending beyond the surface of the shaft for different lengths on opposite sides thereof, and

means for moving the pin longitudinally of the shaft into engagement with the seats of either gear.

2. A reversing mechanism comprising a driving shaft, having a dia-metric slot therein, a pair of contlguous gears rotatably mounted on said shaft, said gears being provided on their contiguous faces with circular shoulders having diametrically disposed slots therein, a ring seated on each shoulder, a stud on each ring extendin into one of the slots, whereby diametrically 'sposed seats of different length are provided on opposite sides of the axis of the gear, a transverse pin disposed in said slot and extending beyond the surface of the shaft for different lengths on opposite sides thereof, and means for moving the pin longitudinally of the shaft into engagement with the seats of either gear.

In testimony whereof, I have hereunto set 30 my hand.

CARL M. F. FRIDEN. 

